JPH01234104A - Inside diameter machining tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an internal diameter machining tool, and in detail:
This invention relates to a machining tool suitable for extremely small inner diameter machining of small products such as OA equipment parts, electronic parts, and small diameter bearings.

[Prior art]

Conventionally, for internal diameter machining, the indexable type has a tip 22 attached to the tip of a holder 21 so as to be freely attached as shown in FIG. 6, and the indexable type has a tip 32 attached to the tip of a holder 31 as shown in FIG. A soldering type in which the blade is fixed with a solder, and an integral type in which the cutting edge portion 44 and the holder portion 43 are ground from a cylindrical body and made of the same material as shown in FIG. 8 have been used.

Among these, the brazing type requires time and effort for installation during cutting, and is also uneconomical, so indexable types and integrated types are currently mostly used.

Note that the throw-away type is used for large-diameter and small-diameter machining of large-sized items such as automobile parts in boat fishing, and the integrated type is used for extremely small-diameter machining of parts for OA equipment, electronic parts, etc. .

As shown in FIG. 8, the integrated tool generally includes a tip 45 consisting of a processing section 44 and a holding section 43.
and a sleeve 46 for firmly supporting the. The tip 45 is usually made by cutting a cylindrical body, but in order to ensure uniformity of the holder, the diameter l of the holding part 43 is the same, and the desired inner diameter can be obtained by changing the shape (diameter) of the processing part 44. Applied to processing.

[Problem that the invention seeks to solve]

However, in the conventional integrated type shown in FIG. 8, the effective protrusion scale is always constant, and even when held by the holding means 46, the effective protrusion scale is fixed in a state protruding from the holding means. Therefore, in the case of internal diameter machining, the machining depth is limited to the maximum, and machining deeper than that is virtually impossible.

Also, the diameter of the holding part! If the diameter t2 of the machined part is extremely small compared to , there are problems such as chattering is likely to occur during cutting and damage is likely to occur at the boundary between the holding part 43 and the machined part 44.

Moreover, when manufacturing the tip itself, the diameter of the machined part is I1. ．． When manufacturing a product by grinding a small one, the amount of grinding increases, which increases the grinding time and ultimately tends to increase costs.

[Purpose of the invention]

The main purpose of the present invention is to solve the above-mentioned problems.Specifically, the invention aims to alleviate the limitations on the machining length of the workpiece, prevent chipping of the inner diameter machining tip itself, and prevent the workpiece from being damaged. It is an object of the present invention to provide a tool for internal diameter machining that can always perform machining with an optimal overhang length regardless of the difference, and can provide stability in cutting.

Still another object is to provide an internal diameter machining tool that can reduce manufacturing costs.

[Means for solving problems]

The present invention provides an inner diameter machining tool comprising a substantially cylindrical inner diameter machining tip composed of a machining part and a holding part, and a holding means for holding the chip, in which the maximum diameter of the machining part of the tip is The maximum diameter of the holding part is set to be almost the same,
There is provided a tip for inner diameter machining, characterized in that the effective protrusion amount set when the tip is fixed to the holding means is variable.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 (=) is a schematic diagram of the inner diameter machining tip used in the tool of the present invention, and FIG.
) is a sectional view taken along line X-X of FIG. According to FIG. 1 (a'), the tip 1 for internal diameter processing is ground from the inner column, and cutting edges 2.2 are provided at both ends as processing parts. A shank portion 3 is formed between the cutting blades 2.2 and is shared as a support portion for the cutting blades 2.2.As shown in Figure 1 (ti), the shank portion 3 has a A positioning flat ^, A is also formed on the side surface, as is a flat B. This flat B is shared by the cutting edge 2.2 as a clearance surface.

FIG. 2 is a schematic perspective view of the inner diameter machining tool of the present invention.

The sleeve 4 is provided with a holding hole 5 on its front surface, and a screw hole 6 that penetrates through the holding hole 5 is provided in the upper part of the sleeve 4. The tip 1 for inner diameter machining is inserted into the holding hole '5, passed through the screw fixing hole 6, and fixed by the screw 7 at the positioning flat portion A of the tip 1.

In addition, the sleeve 4 is formed with a tip attachment part 8 having a large diameter and a tool post attachment part 9 having a small diameter in its longitudinal direction. It is worn with only part 8 exposed.

The major features of the present invention are □, Figure 1 (a) (b)
) As can be understood from □, the maximum diameter of the machined part I11 and the maximum diameter of the shank part! ! ' have almost the same diameter. □ That is, with such a configuration, the effective protrusion amount of the tip 1 protruding from the sleeve 4 in FIG. It has the advantage of being able to freely select the optimum protrusion length as cutting conditions.

That is, chatter and chipping during cutting can be effectively prevented. In addition, because the maximum diameter l of the machining part and the maximum diameter 12 of the shank part of the insert 1 for inner diameter machining are the same diameter, both ends of the chip 1 have cutting edges as shown in FIG. 2 can be provided, and the shank part 3 can be used commonly for attachment to the sleeve 4. Thereby, not only economical effects can be obtained, but also the amount of grinding (removal device) during grinding from the cylindrical body in manufacturing the chip itself can be minimized, and costs can be reduced.

Next, the sleeve 4 used in the present invention will be described.

FIG. 3 is a central sectional view of the sleeve 4. According to FIG. 3, a through hole 1O is formed from the chip holding hole 5 on the front surface of the sleeve 4 to the rear end of the sleeve 4. A pipe threaded portion 11 is provided at the rear end side of the through hole 10 .

A cutting fluid supply a (not shown) is connected to this pipe threaded portion 11, and the cutting fluid is supplied into the through hole lo. Further, this cutting fluid is finally supplied to the cutting edge portion through the gap between the holding hole 5 and the tip 1.

This ensures the supply of cutting fluid during ultra-small diameter cutting, accelerates the discharge of chips, suppresses wear on the cutting edge, and extends the life of the tool.

The internal diameter machining tool of the present invention as described above is particularly effective for extremely small internal diameter machining of small products, but it can of course be applied to large products as well.

In addition, especially when machining extremely small diameters, approximately 3I as tip 1
When using a tip with a diameter of II11 or less, it is desirable to use a collet chuck instead of a sleeve to hold the tip l. There is no need to form a positioning flat part A in the chip 1 used accordingly, and further,
When the chip 1 is extremely thin in this way, if the machining allowance of the flat surface B that constitutes the flank of the chip 1 is large, the cross-sectional area of the support part of the chip becomes small and the rigidity of the chip 1 itself becomes insufficient. It is necessary to make the machining allowance as small as possible.

However, if the machining allowance is small, there will be almost no gap between the machined surface and the shank portion 3 during cutting, so chips may get into the gap and cause problems such as damaging the workpiece surface.

Therefore, as shown in FIG.
By providing a flat portion C that has the same ridge line as B and is inclined at an acute angle θ to the flat portion B, a gap between the machined surface and the holding hole 5 of the shank portion 3 is secured. This makes it possible to smoothly discharge chips and solve the above-mentioned problem.

At this time, it is desirable to set the angle θ to approximately 20 degrees or less in FIG.

Furthermore, according to the present invention, as shown in FIG.
By forming a notch 12 in a part of the longitudinal direction inside the tip mounting hole 5, when attaching the tip having cutting edges at both ends used in the present invention to the sleeve 4, the cutting edge of the tip can be inserted into the notch. By inserting the blade along the , it is possible to prevent the cutting edge at the other end from becoming damaged.

Furthermore, the formation of the notch 12 also has the secondary effect of facilitating the passage of the supply liquid through the mounting hole 5 when supplying the cutting liquid as described above.

〔Effect of the invention〕

As described above in detail, the tool for internal diameter machining of the present invention has the maximum diameter of the machining part and the holding part of the chip for internal diameter machining ground from a rod-shaped body set to be almost the same, so that when the chip is held in the holding means, Since the effective amount of protrusion can be made variable, the optimum cutting conditions can always be selected, and chatter etc. during cutting can be prevented. Moreover, according to the above configuration, processed parts can be formed at both ends of the chip, which is economically effective. Moreover, when manufacturing chips,
Since the amount of grinding of the cylindrical body can be reduced, it is possible to reduce the cost of the product.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic diagram of an inner diameter machining tip according to the present invention, FIG. 1(b) is a sectional view taken along the line X-X of FIG. 1(a), and FIG. 2 is a schematic diagram of an inner diameter machining tip of the present invention. FIG. 3 is a central sectional view of the sleeve used in the present invention; FIG. 4 is a schematic perspective view of the sleeve used in the present invention;
The figure shows a cross section of a holding part showing another embodiment of the tip for inner diameter machining, FIG. 5 is a front view of a sleeve showing another embodiment, and FIG.
8 to 8 are diagrams showing the prior art, in which FIG. 6 shows an indexable type, FIG. 7 shows a brazed type, and FIG. 8 shows an integrated type. l... Inner diameter processing tip 2.2... Cutting edge 3... Shank portion 4... Sleeve 5... Holding hole Patent applicant (663) Kyocera Corporation Agent (8
89B) Patent attorney Katsuhiko Tahara Figure 1

Claims (4)

[Claims] (1) An inner diameter machining tool consisting of a substantially cylindrical inner diameter machining tip composed of a machining part and a holding part, and a holding means for holding the chip, in which the maximum diameter of the machining part of the tip and the A tool for inner diameter machining, characterized in that the maximum diameter of the holding portion is set to be substantially the same, and the effective protrusion amount set when the tip is fixed to the holding means is variable. (2) The inner diameter machining tool according to claim 1, wherein a flank surface is formed in the longitudinal direction of the inner diameter machining tip substantially perpendicular to the rake face of the tip. (3) The tool for inner diameter machining according to claim 1, which has machining parts at both ends of the tip for inner diameter machining. (4) The flank comprises a flat part perpendicular to the rake face of the chip, and an inclined surface that has the same ridge line as the flat part and is inclined at an acute angle to the flat part. 2
Tools for internal machining as described in section.